IBM 990 - Manual (Page 113)

Chapter 3. I/O system structure 101
The z990 OSA-Express GbE LX feature occupies one slot in the z990 I/O cage and has two
independent ports with one PCHID associated with each port. This feature supports the
1000BASE-SX standard transmission scheme.
Each port supports connection to a 1 Gbps Ethernet LAN via a 9 micron single-mode fiber
optic cable terminated with an SC Duplex connector.
Multimode (62.5 or 50 micron) fiber cable may be used with the z990 OSA-Express GbE LX
feature. The use of these multimode cable types requires a mode conditioning patch (MCP)
cable to be used at each end of the fiber link. Use of the single-mode to multimode MCP
cables reduces the supported optical distance of the link to a maximum end-to-end distance
of 550 meters.
The z990 OSA-Express GbE LX feature (feature code 2364) only supports QDIO mode and
TCP/IP. It is defined with CHPID type OSD. The Enterprise Extender (EE) function of
Communications Server for z/OS and OS/390 allows you to run SNA applications and data on
IP networks and IP-attached clients.
OSA-Express GbE SX (feature code 2365, upgrade only)
The z990 OSA-Express GbE SX feature (feature code 2365) can only be brought forward on
an upgrade . Its replacement adapter for new orders is the z990 OSA-Express GbE SX feature
(feature code 1365).
The z990 OSA-Express GbE SX feature occupies one slot in the z990 I/O cage and has two
independent ports with one PCHID associated with each port. This feature supports the
1000BASE-SX standard transmission scheme.
Each port supports connection to a 1 Gbps Ethernet LAN via a 62.5 micron or 50 micron
multimode fiber optic cable terminated with an SC Duplex connector.
The z990 OSA-Express GbE SX feature (feature code 2365) only supports QDIO mode and
TCP/IP. It is defined with CHPID type OSD. The Enterprise Extender (EE) function of
Communications Server for z/OS and OS/390 allows you to run SNA applications and data on
IP networks and IP-attached clients.
OSA-Express 1000BASE-T Ethernet (feature code 1366)
The z990 OSA-Express 1000BASE-T Ethernet, feature code 1366, occupies one I/O slot in
the z990 I/O cage and has two independent ports, with one PCHID associated with each port.
Each port supports connection to either a 1000BASE-T (1000 Mbps), 100BASE-TX (100
Mbps), or 10BASE-T (10 Mbps) Ethernet LAN. The LAN must conform either to the IEEE
802.3 (ISO/IEC 8802.3) standard or the DIX V2 specifications.
Each port has an RJ-45 receptacle for cabling to an Ethernet switch that is appropriate for the
LAN speed. The RJ-45 receptacle is required to be attached using EIA/TIA category 5
unshielded twisted pair (UTP) cable with a maximum length of 100 m (328 ft).
The OSA-Express 1000BASE-T Ethernet feature supports auto-negotiation and automatically
adjusts to 10 Mbps, 100 Mbps, or 1000 Mbps, depending upon the LAN.
LAN speed and/or the duplex mode can be set explicitly, using OSA/SF or the OSA Advanced
Facilities function of the z990 server hardware management console (HMC). The explicit
settings will override the OSA-Express feature port ability to auto-negotiate with its attached
Ethernet switch.